[Madam Malkin's Robes] Purchase Igor Karkaroff Character for 65,000 or the Shifty Wizard for only 7,500. You may purchase other characters as well but for now, only these two characters have Reducto spell.

[The Leaky Cauldron] Blast the silver padlock to get access to the basement.

This is where you can build four scenes from the novels. Building a scene gives you a gold brick. You need all crests in one year to build a scene from that year.